scholarly journals An Aggregate Signature Based Trust Routing for Data Gathering in Sensor Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-30 ◽  
Author(s):  
Jiawei Tang ◽  
Anfeng Liu ◽  
Ming Zhao ◽  
Tian Wang
Keyword(s):  
Performance Analysis ◽  
Data Collection ◽  
Success Rate ◽  
Data Transmission ◽  
Data Gathering ◽  
Data Routing ◽  
Redundant Data ◽  
Aggregate Signature ◽  
Frequent Attack ◽  
Comprehensive Performance

An Aggregate Signature based Trust Routing (ASTR) scheme is proposed to guarantee safe data collection in WSNs. In ASTR scheme, firstly, the aggregate signature approach is used to aggregate data and keep data integrity. What is more important, a light aggregate signature based detour routing scheme is proposed to send abstract information which includes the data sending time and ID of data, nodes’ ID to the sink over different paths which can verify whether the data reaches the sink safely. In addition, the trust of a path is evaluated according to the success rate of the path. The trust of paths susceptible to frequent attack will be lowered and the path with high trust will be selected for data routing to avoid data gathering through low trust path and thereby increase the success rate of data gathering. Our comprehensive performance analysis has shown that, the ASTR scheme is able to effectively ensure an increase in success rate of data transmission by 23.23%, reduce the data amount loaded by the node by 53.59%, reduce the redundant data by 41.70%.

scholarly journals FLECH: Fuzzy Logic Based Energy Efficient Clustering Hierarchy for Nonuniform Wireless Sensor Networks

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Baranidharan Balakrishnan ◽  
Santhi Balachandran
Keyword(s):  
Fuzzy Logic ◽  
Data Collection ◽  
Data Transmission ◽  
Energy Efficient ◽  
Clustering Algorithm ◽  
Residual Energy ◽  
Base Station ◽  
Wireless Sensor ◽  
Redundant Data ◽  
Energy Efficient Clustering

Lifetime of Wireless Sensor Network (WSN) is an important issue which affects its implementation in various real time applications. The major factor behind the energy consumption in WSN is its data collection mechanism. The direct data transmission from each sensor node to the Base Station (BS) consumes more energy than other alternatives. Also it is unnecessary, due to redundant data transmission because of geographically closer nodes. Clustering is the best data collection architectural model for WSN since it takes care of in-network processing which handles redundant data within the network. The techniques used for the network having uniform node distribution are not suitable for the networks which have nonuniformly distributed nodes. This paper contributes a novel clustering algorithm: Fuzzy Logic Based Energy Efficient Clustering Hierarchy (FLECH) for nonuniform WSN. The clusters in FLECH are created using proper parameters which increases the lifetime of the WSN. Fuzzy logic in FLECH is wisely used to combine important parameters like residual energy, node centrality, and distance to BS for electing best suitable nodes as CH and increases the network lifetime. FLECH performance is verified in different scenarios and the results are compared with LEACH, CHEF, ECPF, EAUCF, and MOFCA. The simulation results clearly indicate the lifetime increase by FLECH over other algorithms and its energy conservation per round of data collection in the network.

scholarly journals LPTA: Location Predictive and Time Adaptive Data Gathering Scheme with Mobile Sink for Wireless Sensor Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Chuan Zhu ◽  
Yao Wang ◽  
Guangjie Han ◽  
Joel J. P. C. Rodrigues ◽  
Jaime Lloret
Keyword(s):  
Energy Consumption ◽  
Sensor Networks ◽  
Data Transmission ◽  
Time Synchronization ◽  
Data Gathering ◽  
Mobile Sink ◽  
Data Routing ◽  
Data Packets ◽  
Current Location ◽  
Balance Energy

This paper exploits sink mobility to prolong the lifetime of sensor networks while maintaining the data transmission delay relatively low. A location predictive and time adaptive data gathering scheme is proposed. In this paper, we introduce a sink location prediction principle based on loose time synchronization and deduce the time-location formulas of the mobile sink. According to local clocks and the time-location formulas of the mobile sink, nodes in the network are able to calculate the current location of the mobile sink accurately and route data packets timely toward the mobile sink by multihop relay. Considering that data packets generating from different areas may be different greatly, an adaptive dwelling time adjustment method is also proposed to balance energy consumption among nodes in the network. Simulation results show that our data gathering scheme enables data routing with less data transmission time delay and balance energy consumption among nodes.

scholarly journals The Learning Pathways Grid

2018 ◽  
Vol 17 (1) ◽  
pp. 160940691879160 ◽  
Author(s):  
Andrew Stuart Lane ◽  
Chris Roberts
Keyword(s):  
Qualitative Research ◽  
Data Collection ◽  
Data Gathering ◽  
High Fidelity ◽  
High Fidelity Simulation ◽  
Cognitive Frames ◽  
Open Disclosure ◽  
Learning Pathways ◽  
Social Constructivist Approach ◽  
Insight Into

The interview is an important data-gathering tool in qualitative research, since it allows researchers to gain insight into a person’s knowledge, understandings, perceptions, interpretations, and experiences. There are many definitions of reflexivity in qualitative research, one such definition being “Reflexivity is an attitude of attending systematically to the context of knowledge construction, especially to the effect of the researcher, at every step of the research processes.” The learning pathways grid (LPG) is a visual template used to assist analysis and interpretation of conversations, allowing educators, learners, and researchers, to discover links from cognition to action, usually in a retrospective manner. It is often used in simulation educational research, with a focus on understanding how learners access their cognitive frames and underlying beliefs. In this article, we describe the use of the LPG as a prospective adjunct to data collection for interviews and focus groups. We contextualize it within a study among medical interns and medical students who were engaged in high-fidelity simulation exploring open disclosure after a medication error. The LPG allowed future optimization of data collection and interpretation by ensuring reflexivity within the researchers, a vital part of research conduct. We conclude by suggesting the use of the LPG has a reasonable fit when taking a social constructivist approach and using qualitative analysis methods that make reflexivity explicit and visible, therefore ensuring it is truly considered, understood, and demonstrated by researchers.

scholarly journals Comprehensive Performance Analysis of a VCSEL-based Photonic Reservoir Computer

2021 ◽  
pp. 1-1
Author(s):  
Julian Bueno ◽  
Joshua Robertson ◽  
Matej Hejda ◽  
Antonio Hurtado
Keyword(s):  
Performance Analysis ◽  
Comprehensive Performance

scholarly journals Mask-Making and Drawing as Method: Arts-Based Approaches to Data Collection With War-Affected Children

2019 ◽  
Vol 18 ◽  
pp. 160940691983247
Author(s):  
Amber Green ◽  
Myriam Denov
Keyword(s):  
Data Collection ◽  
Research Team ◽  
Data Gathering ◽  
Research Process ◽  
Future Research ◽  
Northern Uganda ◽  
Visual Methods ◽  
Conflict Zones ◽  
Mask Making ◽  
In Captivity

Globally, the numbers of children living in conflict zones and displaced by war have risen dramatically over the past two decades, and with this, scholarly attention to the impacts of war on children. More recently, researchers have examined how war-affected children are being studied, revealing important shortcomings. These limitations relate to the lack of child participation in research, the need for researchers to engage children in the research process as “active agents” rather than “passive objects” under study, as well as the need for researchers to pay closer attention to ethical dilemmas associated with researching war-affected children. To address these realities, innovative research methods that can be adapted across diverse sociocultural contexts are warranted. In light of these shortcomings, our research team integrated two arts-based methods: mask-making and drawing, alongside traditional qualitative data collection methods with a particularly marginalized population of young people: children born in captivity within the Lord’s Resistance Army in northern Uganda. In this article, we provide information on the context of northern Uganda. We describe how the use of mask-making and drawing was used as data gathering tools and the ways in which these arts-based methods had important benefits for the research participants, researchers, and impacted on the validity of the research as a whole. We propose that the use of these participatory visual methods enriched the themes elicited through more traditional methods. The article describes how these arts-based mediums fostered community building among children typically excluded from their communities and were successful as a tool to build trust between participants and the research team when exploring sensitive topics. The article concludes with implications for future research with war-affected children.

Decolonizing Cultural Probes in Ethnographic Research: Perspective of African Scholars

2021 ◽  
pp. 002193472110210
Author(s):  
Akpovire Oduaran ◽  
Okechukwu S. Chukwudeh
Keyword(s):  
Data Collection ◽  
Political Development ◽  
Data Gathering ◽  
Ethnographic Research ◽  
Research Perspective ◽  
Extant Literature ◽  
The People ◽  
The Gift ◽  
Conceptual Paper

The epistemological positioning that frequently validates the application of cultural probes in eliciting detailed exploration of phenomenon has not been sufficiently interrogated. Yet the epistemological assumptions behind the value of cultural probes continue to be drummed up and foisted on Africa’s emerging ethnographic researchers who actually need to be a bit more critical in its adoption and application. This conceptual paper explores the extant literature on data collection based essentially on cultural probes as espoused in habitus. It is proposed that profound amounts of decolonization of the spirit, content, and process of data gathering is urgent and critical at this stage. Until this is done objectively, African ethnographic researchers should “look at the gift horse in the mouth” before they can properly configure what is right or wrong for the people of Africa who should be in the hot pursuit of the ownership, production and utilization of relevant and sacrosanct knowledge aimed at rapid socio-economic and political development of the continent.

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